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Photonic analogue-to-digital converted based on wavelength division multiplexing technique

Alves , T. M. F. ; Cartaxo, A.

Photonic analogue-to-digital converted based on wavelength division multiplexing technique, Proc ICETE International Conf. on Optical Communication Systems - OPTICS, Sevilha, Spain, Vol. 1, pp. 1 - 10, July, 2011.

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Abstract
A photonic (Ph) analogue-to-digital (ADC) converter architecture based on the wavelength division multiplexing
(WDM) technique used to provide compressed spectrum of the ultra wideband radio signals that are being
used in a given pico-cell area for monitoring purposes is presented. The signal at the different points of the
WDM Ph-ADC architecture is analyzed and discussed in detail. The advantages/disadvantages of the WDM
architecture are identified and compared with its time division multiplexing (TDM) counterpart.
It is shown that the WDM Ph-ADC architecture provides adequate time stretching of the wireless signals
captured in a given pico-cell. This system enables relaxing the bandwidth requirements of the electrical ADCs
used to digitize the wireless signals prior digital signal processing is applied for spectrum and transceivers
localization monitoring. In addition, it is concluded that the WDM Ph-ADC architecture supports higher
pulse repetition rates than the TDM Ph-ADC architecture being of special interest when a fast up-date of the
radio channel monitoring is required.